#include<stdio.h>

int main()
{
    int n, step;
    while(scanf("%d", &n) != EOF)
    {
        step = 0;
        while(n != 1)
        {
            if(n % 2 == 0)
                n /= 2;
            else
                n = n * 3 + 1;
            step ++;
        }
        printf("%d\n", step);
    }
    return 0;
}